I actually did what I should have done first and sent an e-mail to the ancestry website I was particularly having trouble with. They advised me that there's a problem with downloading from their site with IE9. That makes a lot of sense since I realized the problem fairly recently and it wasn't that long ago that I upgraded. I can only assume that they're not the only ones having a problem since, as I originally wrote, my son had a problem as well with a file he downloaded and subsequently saved to a cloud account. I wonder when IE10 will be out?!
Thank you all for your advice!